Derrick safety cage



Jan. 25, 1927. 7

M. SCHWAFEL- DERRICK SAFETY CAGE Filed June 22, 1926 2 Sheets-Sheet 1 INVENTORj-' mkc w ATTORNEY Jan. 25, 1927. 1,615,657

M. SCHWAFEL DERRICK SAFETY CAGE Filed'June 22, 1926 v 2 Sheets-Sheet 2 v INVENTOR Wife Jc%ira eZ,

BY kn w QATTORNEY Patented Jan. 25, 1927.

' MI KE "SCHWATEL, 0F TAFT, CALIFORNIA.

DERRICK l SAFETY GAGE.

"Applicationfiled June 22, 1926.

This invention relates .to inclined cage hoists such as are used in connection with well derrioks and the like, the invention being preferably termed 'a derrick safety cage.

In devices ofthis description an inclined supporting cable is frequently used. this cable running from the topofthe derrick frame to the ground and supporting a wheeled carriage from which depends the cage for passengers and material.

One importantobject of the present invention is to improve the general construction of devices of this description.

A second important object of the invention is to provide an improved arrangement of safety latch and brake means for such devices.

A third important object of the invention is to so arrange the latch releasing and brake applying means that the act of releasing the latch will effect application of the brake.

With the above and other objects in view as will be hereinafter apparent, the invention consists in general of certain novel details of construction and combinations of parts hereinafter fully described, illustrated in the accompanying drawings and specifically claimed.

In the accompanying drawings like characters of reference indicate like parts in the several views, and

Figure 1 is a side elevation of a well derrick, partly broken away, showing the improved cage and carriage arrangement.

Figure 2 is an enlarged vertical longitudinal median section through the carriage.

Figure 3 is an end view of the carriage drawn to a still larger scale.

Figure 1- is a section on the line 44: of Figure 2, the view being to the same scale as Figure 3.

The derrick frame is indicated in general at 10 and, as the particular framing details form no part of the present invention, it will be sufficient to say that this frame is provided near its to with a working platform 11 so positioned that the floor 12 of the cage 13 is level with this platform when the cage is in its raised position.

Extending downwardly in an inclined direction from the top of the derrick 10 is a carrying cable 14 which has its lower end firmly secured to some suitable anchorage on the ground, the same not being deemed necessary here to be shown.

Serial No. 117,778.

The carriage consists of a housing or frame 15 wherein are mounted shafts 16 supporting grooved wheels 17 running on the cable 14:, The cage is supported from this housing by meansof suitable hangersthe arm 21 is a cord or link 23 having a handle 24 at its lower end placed convenient of access by a person riding in the cage.

Clamped to the cable 14 is a latch member 25 engageable by a hook 26 pivoted to a bracket 27 borne by the upper end of the housing 15. This hook is urged to latch engaging position by a spring 28 and is drawn outof suchposition by a cord 29 which has one end fastened to the hook and runs over a pulley 30 on the bracket 27 to the arm 21 to which it is secured. With this arrangement pulling downwardly on the handle 24- releases the hook and at the same time applies the brake so that release of the hook is not accompanied by a sudden and dangerous downward movement of the cage.-

Attached to the housing 15 is a hoisting cable 32. which runs over a pulley 32 mounted on the derrick and leads to a winding drum or Windlass 83 mounted at the bottom of the derrick frame.

In operation Whenever the cage is hoisted the hook 26 engages the latch member 25 and thus holds the cage securely in its elevated position. When it is desired to lower the cage the handle 24 is pulled downwardly which frees the hook and simultaneously applies the brakes so that the cage moves slowly downward on the cable 14;. the speed being regulated by the force applied to the handle 24.

There has thus been provided a simple and efficient device of the kind described and for the purpose specified.

It is obvious that minor changes may be made in the form and construction of the invention without departing from the material spirit thereof. It is not, therefore, desired to confine the invention to the exact form herein shown and described but it is desired to include all such as properly come within the scope claimed.

Having thus described the invention, what claimed as new is:

1. In a cage hoist, an inclined supporting cable. a carriage running on said supporting cable. latch means arranged to hold the carriage in its uppermost position on the cable, brake means supported on the carriage to engage said cable, and means to release the latch means and simultaneously apply the brake means.

2. In a cage hoist, an inclined supporting cable, a carriage running; on said support ing able. latch means arranged to hold the tarriage in its uppermost position on the cable, brake means supported on the carriage to engage said cable. a brake applying lever pivoted to thecarriage and mo able to ap ply the brake means, and an operative connection between the lever and latch means.

3. In a cage hoist, an inclined supporting cable, a carriage running on said cable, a pair of brake arms pivotally mounted on said carriage and arranged to engage opposite sides of the cable, a brake lever pivoted intermediate its ends in said carriage and having one arm bearirng against one of said brake arms, the remaining arm of said lever having link connection With the remaining brake arm. a latch member fixed on said cable above said carriage, a hook pivoted at the upper end of said carriage and engageable with the latch. member, a spring urging said. hook downwardly, a pulley supported on the carriage above said hook, a cord running over said pulley and having its ends connected to the hook and last men tioned brake lever arm respectively, and a pull handle depending from the extremity of the said last mentioned brake lever arm.

In testimony whereof I atlix my signature.

MIKE SCHl VAFEL. 

